Crop Science Journal of Natural Resources and Life Sciences Education
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Published in Crop Sci 8:176-178 (1968)
© 1968 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Juvenile and Adult Plant Growth Relationships in Wheat1

R. E. Allan, J. A. Pritchett and Annette Patterson2

This study dealt with the relationship of coleoptile length, first seedling leaf length, culm length, and flag leaf length of 10 wheat (Triticum aestivum L.) crosses involving seven standard-height and seven semidwarf parents. Parents included 'Dickson 114,' 'Itana' (tall, standard height); 'Cheyenne,' 'Golden' (midtall, standard height); 'Omar,' 'Burt,' 'Nord' (short, standard height); Sel. 92, 'Suwon 92,' 'Gaines,' Gaines sib 2, 'Seu Seun 27' (medium, semidwarf); Sel. 14, and Sel. 135 (short, semidwarf). Previous results with semidwarf x standard height crosses showed juvenile plant traits correlated closely with culm length. Our purpose was to determine the relationships between juvenile and adult traits in crosses of short semidwarf x medium semidwarf, medium semidwarf x medium semidwarf, medium semidwarf x standard height, and standard height x standard height crosses as well. Genotypic correlations between culm length and the two juvenile criteria varied between .38 to .89 for short semidwarf x standard height and short semidwarf x medium semidwarf crosses, but no association occurred in standard height x standard height crosses. Coleoptile length and seedling leaf length are genetically related in some crosses but not in others. The degree of association was generally closest for semidwarf x standard height crosses. Moderate positive correlations occurred between adult flag leaf length and culm length in all crosses but two. Coleoptile length and seedling leaf length related with flag leaf length in the Sel. 14 x Nord cross only. Parallel relationships between juvenile and adult plant traits are primarily contingent upon semidwarf germplasm although semidwarf Sel. 92 represents a unique exception. Close genetic relationships between juvenile and adult traits typically occurred in semidwarf x standard height crosses involving semidwarf germplasm Sel. 14 and Suwon 92. Apparently a common genetic system regulates growth of all traits for these two genotypes.

Key Words: genotypic correlation • phenotypic correlation • Triticum aestivum L. • seedling vigor

1 Cooperative investigations of the Crops Research Division, ARS, USDA, and Washington Agricultural Experiment Stations, Scientific Paper No. 3016, Pullman, Washington, Project 1467.

2 Geneticist, Research Technician, and Laboratory Assistant, Crops Research Division, ARS, USDA, Pullman, Washington 99163.

Received for publication August 9, 1967.




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